Boot Problems

colorpurple21859 · 10-05-2019, 09:48 AM

remove all drives but the one can't get to boot
make sure legacy is disable in bios
boot from the rescue usb
run the following commands

Code:

vgchange -a y
mount /dev/mapper/centos-root /sysimage
mount /dev/sda2 /sysimage/boot
mount /dev/sda1 /sysimage/boot/efi
mount --bind  /dev /sysimage/dev
mount --bind /proc /sysimage/proc
mount --bind /sys /sysimage/sys
mount -o bind /run /sysimage/run
chroot /sysimage
grub2-install /dev/sda
grub2-mkconfig -o /boot/grub2/grub.cfg

with whatever console text editor you want to use
put a # in front of every line in /etc/fstab except for the following

Code:

/dev/mapper/centos-root /                       xfs     defaults        0 0
/dev/sda2		/boot                   xfs     defaults        0 0
/dev/sda1	        /boot/efi               vfat    umask=0077,shortname=winnt 0 0
/dev/mapper/centos-home /home                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0

exit out of the chroot, poweroff, remove usb and reboot

BeeRich · 10-05-2019, 10:32 AM

Quote:

Originally Posted by colorpurple21859

remove all drives but the one can't get to boot
make sure legacy is disable in bios
boot from the rescue usb
run the following commands

Code:

vgchange -a y
mount /dev/mapper/centos-root /sysimage
mount /dev/sda2 /sysimage/boot
mount /dev/sda1 /sysimage/boot/efi
mount --bind -o /dev /sysimage/dev
mount --bind -o /proc /sysimage/proc
mount --bind -o /sys /sysimage/sys
chroot /sysimage
grub2-install /dev/sda
grub2-mkconfig -o /boot/grub2/grub.cfg

with whatever console text editor you want to use
put a # in front of every line in /etc/fstab except for the following

Code:

/dev/mapper/centos-root /                       xfs     defaults        0 0
/dev/sda2		/boot                   xfs     defaults        0 0
/dev/sda1	        /boot/efi               vfat    umask=0077,shortname=winnt 0 0
/dev/mapper/centos-home /home                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0

exit out poweroff, remove usb and reboot

As for the bios, I'm not sure what you mean by legacy. The UEFI setup is a bit strange. Here is the manual, and I think what you're looking for is on page 87:

http://asrock.pc.cdn.bitgravity.com/...97M%20Pro4.pdf

As for the instructions:

Code:

$ mount /dev/mapper/centos-root /sysimage
mount: mount point /sysimage does not exist

colorpurple21859 · 10-05-2019, 10:43 AM

Code:

mkdir /sysimage

before running the mount commands

colorpurple21859 · 10-05-2019, 11:16 AM

Quote:

not sure what you mean by legacy.

on your system it is called csm under the boot screen. Leave as is for now, will change later if needed.

I edited the mount commands in post #16, I add a mount command and removed some of the -o

business_kid · 10-06-2019, 03:41 AM

Quote:

not sure what you mean by legacy.

Legacy usually is the non-uefi boot option. It's the old way.

BeeRich · 10-06-2019, 10:57 AM

Quote:

Originally Posted by business_kid

Legacy usually is the non-uefi boot option. It's the old way.

Ya that is/was confusing because there's reference in the UEFI boot menu (F2). I don't think I've seen any legacy BIOS boot window. Only setting the UEFI back to defaults is what brought back other drives, which was the Legacy Only option in the drive options. .

BeeRich · 10-06-2019, 11:17 AM

Quote:

Originally Posted by colorpurple21859

on your system it is called csm under the boot screen. Leave as is for now, will change later if needed.

I edited the mount commands in post #16, I add a mount command and removed some of the -o

OK, progressing with this:

Everything worked up until...

Code:

grub2-install /dev/sda
Installing for i386-pc platform
grub2-install: warning: this GPT partition label contains no BIOS Boot Partition; embedding wont' be possible.
grub2-install: warning: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged..
grub2-install: error: will not proceed with blocklists.

Note: this is a 64-bit machine. Previously I had to open up DHCP on the ethernet nic and install some grub package when chrooted.

Code:

yum -y reinstall grub2-tools grub2-efi shim grub2-efi-modules grub2-efi-x64-modules

Did not do that this time, so waiting for your clarity on this one.

colorpurple21859 · 10-06-2019, 01:55 PM

You booted the usb in csm mode and not efi mode. Disabling csm in bios will prevent this. Page 86 in your manual
you may be able to just run the grub2-mkconfig after editing the /etc/fstab

BeeRich · 10-07-2019, 11:18 AM

OK, everything seems fantastic so far. Everything mounted, and I shoved in two other volumes previously formatted. So far so good. Now to see if the backup crons work and I'm golden.

I'll be monitoring, but again, thank you for all the help.

colorpurple21859 · 10-07-2019, 11:43 AM

Great you got it working.

BeeRich · 10-07-2019, 11:44 AM

Quote:

Originally Posted by colorpurple21859

Great you got it working.

So far so good. Not sure what we went through, but it's working. Much happy.

colorpurple21859 · 10-07-2019, 11:48 AM

I suspect it was a combination of your fstab and your grub.cfg causing the problem

BeeRich · 10-07-2019, 11:57 AM

Quote:

Originally Posted by colorpurple21859

I suspect it was a combination of your fstab and your grub.cfg causing the problem

Yeah the movement of partitions and reassignment meant a new grub.cfg build, I'm guessing. My fstab was from the previous setup. Then the whole confusion about legacy bios in the UEFI...what a mess. 4 layers of confusion. But it's all documented now and apparently good to go, with a much better understanding.